Added texture wrap demo....

third_party/gles2_book/Chapter_9/TextureWrap/TextureWrap.c

 //
 // Book:      OpenGL(R) ES 2.0 Programming Guide
 // Authors:   Aaftab Munshi, Dan Ginsburg, Dave Shreiner
 // ISBN-10:   0321502795
 // ISBN-13:   9780321502797
 // Publisher: Addison-Wesley Professional
 // URLs:      http://safari.informit.com/9780321563835
 //            http://www.opengles-book.com
 //
 
 // TextureWrap.c
 //
 //    This is an example that demonstrates the three texture
 //    wrap modes available on 2D textures
 //
 #include <stdlib.h>
-#include "esUtil.h"
-
-typedef struct
-{
-   // Handle to a program object
-   GLuint programObject;
-
-   // Attribute locations
-   GLint  positionLoc;
-   GLint  texCoordLoc;
-
-   // Sampler location
-   GLint samplerLoc;
-
-   // Offset location
-   GLint offsetLoc;
-
-   // Texture handle
-   GLuint textureId;
-
-   // Vertex buffer object handle
-   GLuint vboIds[2];
-
-} UserData;
+#include "TextureWrap.h"
 
 ///
 //  Generate an RGB8 checkerboard image
 //
 static GLubyte* GenCheckImage( int width, int height, int checkSize )
 {
    int x,
        y;
    GLubyte *pixels = malloc( width * height * 3 );
    
@@ skipping 55 matching lines @@
    glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 
    return textureId;
 
 }
 
 
 ///
 // Initialize the shader and program object
 //
-int Init ( ESContext *esContext )
+int twInit ( ESContext *esContext )
 {
-   UserData *userData = esContext->userData;
+   TWUserData *userData = esContext->userData;
    GLbyte vShaderStr[] =
       "uniform float u_offset;      \n"
       "attribute vec4 a_position;   \n"
       "attribute vec2 a_texCoord;   \n"
       "varying vec2 v_texCoord;     \n"
       "void main()                  \n"
       "{                            \n"
       "   gl_Position = a_position; \n"
       "   gl_Position.x += u_offset;\n"
       "   v_texCoord = a_texCoord;  \n"
@@ skipping 47 matching lines @@
    glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
    return TRUE;
 }
 
 ///
 // Draw a triangle using the shader pair created in Init()
 //
 #define VTX_POS_SIZE 4
 #define VTX_TEX_SIZE 2
 #define VTX_STRIDE (6 * sizeof(GLfloat))
-void Draw ( ESContext *esContext )
+void twDraw ( ESContext *esContext )
 {
-   UserData *userData = esContext->userData;
+   TWUserData *userData = esContext->userData;
    GLuint offset = 0;
       
    // Set the viewport
    glViewport ( 0, 0, esContext->width, esContext->height );
    
    // Clear the color buffer
    glClear ( GL_COLOR_BUFFER_BIT );
 
    // Use the program object
    glUseProgram ( userData->programObject );
@@ skipping 26 matching lines @@
    glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
    glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
    glUniform1f ( userData->offsetLoc, 0.0f );
    glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0 );
 
    // Draw quad with mirrored repeat
    glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT );
    glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT );
    glUniform1f ( userData->offsetLoc, 0.7f );
    glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0 );
-
-   eglSwapBuffers ( esContext->eglDisplay, esContext->eglSurface );
 }
 
 ///
 // Cleanup
 //
-void ShutDown ( ESContext *esContext )
+void twShutDown ( ESContext *esContext )
 {
-   UserData *userData = esContext->userData;
+   TWUserData *userData = esContext->userData;
 
    // Delete texture object
    glDeleteTextures ( 1, &userData->textureId );
 
    // Delete program object
    glDeleteProgram ( userData->programObject );
 
    // Delete vertex buffer objects
    glDeleteBuffers ( 2, userData->vboIds );
 }
-
-
-int main ( int argc, char *argv[] )
-{
-   ESContext esContext;
-   UserData  userData;
-
-   esInitContext ( &esContext );
-   esContext.userData = &userData;
-
-   esCreateWindow ( &esContext, "MipMap 2D", 640, 480, ES_WINDOW_RGB );
-   
-   if ( !Init ( &esContext ) )
-      return 0;
-
-   esRegisterDrawFunc ( &esContext, Draw );
-   
-   esMainLoop ( &esContext );
-
-   ShutDown ( &esContext );
-}